Mold forming method and apparatus, and plastic lens manufacturing method and apparatus
A method of forming a mold, concludes: winding a tape around peripheral surfaces of a first molding die and a second molding die to assemble a mold; forming on the tape an injection port for injecting a resin material for forming a plastic lens into the mold; and forming a tab by cutting out a part of the tape non-circularly.
1. A method of forming a mold provided by winding a tape around peripheral surfaces of a first molding die and a second molding die, the mold having an injection port for injecting resin material into an inside of the mold, the injection port including an injection port main body and a tab for sealing the injection port main body, the method comprising:
forming the tab by cutting out part of the tape non-circularly; and
winding the tape around the peripheral surfaces of the first molding die and the second molding die,
wherein the tab forming comprises: providing the tab by a part of the tape integrated with the rest of the tape, the tab and the rest of the tape being connected in a bendable manner, and forming the tab in advance and superimposing a tape-like injection port forming portion having the injection port main body formed in advance onto the tab,
the tape superimposing comprises positioning the injection port main body formed to have an area smaller than the area of the tab so that the injection port main body is positioned over the tab; and
the tape winding comprises winding the tape around the peripheral surfaces of the first molding die and the second molding die so that both end portions of the tape are superimposed on each other and the tab is exposed.
2. The method of forming a mold according to claim 1 , wherein:
the injection port forming portion is formed continuously with the end portion of the tape; and
formation of the injection port main body and formation of the tab are carried out at the same time.